#include <stdio.h>
#include <assert.h>
char* my_strcat(char *dest,const char *src)
{
	assert(dest && src);
	char* ret = dest;
	while(*dest)
	{
		dest++;
	}
	while(*dest++ = *src++)
	{
		;
	}
	return dest;
}


int main()
{
	char arr1[20] = "abcdef";
	char arr2[] = "hijklmn";
	my_strcat(arr1, arr2);
	printf("%s", arr1);
	return 0;
}


